Division - A subdivision of a hazard class.
DOT Exemption - Administrative relief granted on the basis of new technology of equivalent levels of
safety or levels of safety consistent with the public interest and the policy of the Hazardous Materials
Drum - A flat-ended or convex-ended cylindrical packaging made of metal, fiberboard, plastic, plywood,
or other suitable materials.
Egress - Exit.
Expiration Date - (As relates to Shelf-life) The date by which nonextendible items should be discarded
as no longer suitable for issue or use.
Flash Point - The minimum temperature at which a liquid within a test vessel gives off vapor in
sufficient concentration to form an ignitable mixture with air near the surface of the liquid. Flash points
are determined by the testing prescribed in 49 CFR 173.120.
FSC - Federal supply class. The four-digit number preceding the NIIN that signifies the special group to
which an item belongs (e.g. 6810, Chemicals; 8040, Adhesives)
FSCM/FSCNM - Federal Supply Code for Manufacturers/Federal Supply Code for Nonmanufacturers.
The five-position code assigned to any contractor who does business with the Government. For purposes
of this document, when FSCM is written, it can be assumed that FSCNM is also included. (now retitled
Handlers - Personnel who handle hazardous materials or hazardous materials documentation.
Hazard Class - The category of hazard assigned to a hazardous material based on defining criteria.
Hazard classes are: explosives (Class 1), compressed gases (Class 2), flammable liquids (Class 3),
flammable solids (Class 4), oxidizers and organic peroxides (Class 5), poisons and infectious substances
(etiologic agents) (Class 6), radioactive materials (Class 7), corrosive materials (Class 8), and
miscellaneous dangerous goods (Class 9).
Hazard Zone - One of four levels of hazard (hazard zones A through D) assigned to gases and one of
two levels of hazard (hazard zones A and B) assigned to liquids that are poisonous by inhalation. A
hazard zone is based on the LC50 value for acute inhalation toxicity of gases and vapors.
Hazardous Cargo Inspectors - DoD personnel whose duties require them to review the integrity of the
packaging and accuracy of documentation for all hazardous materials being transported within the
Defense Transportation System (DTS) or by commercial carriers.